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| author | Mehdi Djait <mehdi.djait@linux.intel.com> | 2025-07-07 16:32:53 +0200 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2025-08-13 15:10:18 +0200 |
| commit | 7ecb662b717a34305beacf71e9fadd1559b4b9ee (patch) | |
| tree | e6a87ac7019c86facc987badecc27f857e8ab1c8 /include/media | |
| parent | media: staging: Rename second ioctl handlers argument to 'void *priv' (diff) | |
| download | linux-7ecb662b717a34305beacf71e9fadd1559b4b9ee.tar.gz linux-7ecb662b717a34305beacf71e9fadd1559b4b9ee.zip | |
media: v4l2-common: Add a helper for obtaining the clock producer
Introduce a helper for v4l2 sensor drivers on both DT- and ACPI-based
platforms to retrieve a reference to the clock producer from firmware.
This helper behaves the same as devm_clk_get() except where there is
no clock producer like in ACPI-based platforms.
For ACPI-based platforms the function will read the "clock-frequency"
ACPI _DSD property and register a fixed frequency clock with the frequency
indicated in the property.
This function also handles the special ACPI-based system case where:
. The clock-frequency _DSD property is present.
. A reference to the clock producer is present, where the clock is provided
by a camera sensor PMIC driver (e.g. int3472/tps68470.c)
In this case try to set the clock-frequency value to the provided clock.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-common.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 0a43f56578bc..9d6c236e8f14 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -97,6 +97,7 @@ int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, /* ------------------------------------------------------------------------- */ +struct clk; struct v4l2_device; struct v4l2_subdev; struct v4l2_subdev_ops; @@ -620,6 +621,32 @@ int v4l2_link_freq_to_bitmap(struct device *dev, const u64 *fw_link_freqs, unsigned int num_of_driver_link_freqs, unsigned long *bitmap); +/** + * devm_v4l2_sensor_clk_get - lookup and obtain a reference to a clock producer + * for a camera sensor. + * + * @dev: device for v4l2 sensor clock "consumer" + * @id: clock consumer ID + * + * This function behaves the same way as devm_clk_get() except where there + * is no clock producer like in ACPI-based platforms. + * + * For ACPI-based platforms, the function will read the "clock-frequency" + * ACPI _DSD property and register a fixed-clock with the frequency indicated + * in the property. + * + * This function also handles the special ACPI-based system case where: + * + * * The clock-frequency _DSD property is present. + * * A reference to the clock producer is present, where the clock is provided + * by a camera sensor PMIC driver (e.g. int3472/tps68470.c) + * + * In this case try to set the clock-frequency value to the provided clock. + * + * Returns a pointer to a struct clk on success or an error pointer on failure. + */ +struct clk *devm_v4l2_sensor_clk_get(struct device *dev, const char *id); + static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf) { /* |